向BankAccount类添加ArrayList<Double> getStatement()方法

import java.util.ArrayList;

public class BankAccount {
    private ArrayList<Double> transactions;

    public BankAccount() {
        transactions = new ArrayList<>();
    }

    // 添加交易记录
    public void addTransaction(double amount) {
        transactions.add(amount);
    }

    // 获取交易记录
    public ArrayList<Double> getStatement() {
        return transactions;
    }
}

public class Main {
    public static void main(String[] args) {
        BankAccount account = new BankAccount();
        
        // 添加交易记录
        account.addTransaction(100.0);
        account.addTransaction(-50.0);
        account.addTransaction(200.0);
        
        // 获取交易记录
        ArrayList<Double> statement = account.getStatement();
        
        // 打印交易记录
        for (double transaction : statement) {
            System.out.println(transaction);
        }
    }
}